Is there a way in the Autonumber Format to add a return to create a blank line between items in a list? Right now, I can only do it by removing the Autonumber format for the new paragraph and then add it back in for the next line. Seems like there would be a way to add a building block for this.

By blank line, I meant space below. A building block in the autonumber format to add a return would be nice. I used the recommendation in the reply from @Error7103. It worked just fine. I now have a paragraph tag for my lists.

Your example of a figure number and figure caption on separate lines is easily supported in structured documents. One solution would be to put the figure number in an autonumber but use a prefix consisting of a forced return (entered as \r or \n) as well. If the figure number and caption appear above the graphic, or at the start of some other element, another is to give the containing element a prefix of a space. Since the caption is a paragraph, that space and the caption would be in different paragraphs and could have different paragraph formats.